Elektra, Daughter of the Hand (Marvel Super Heroes)

Legendary Creature Ñ Human Ninja Villain - Sneak {1}{B}{B} (You may cast this spell for {1}{B}{B} if you also return an unblocked attacker you control to hand during the declare blockers step. She enters tapped and attacking.)
When Elektra enters, destroy target creature an opponent controls with power 3 or less.